Hot-air syringe



O. H. AND A1F. PIEPER.

HOT A-IR SYRINGE.

APPLlcATsoN msn 001,1111918.

1,369,935. Patented Mar. 1, 1921.

` n @g1/W) gaf ATTORNB@C fiol g UNiTEDfsTATEs PATENT l OFFICE..

oscAJa H. HEBER ANn ALPHoNsE r. Haren, or ROCHESTER, NEW YORK,vk

. i Specification of Letters Patent.

Hor-11R sYniNGiE.

Patented Mar. 1, 1921.

Original application led August 13, 1917, Serial No. 185,863. Divided andlthis application led October To all whomz't ma? conccraf l Be it known t at we, OSCAR `H. PIEPER and yALrrioNsn F.. Pinnen, both of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Hot-Air Syringes; and we do hereby declare the following to be a full, clear, and exact description of the f syringes'of this kind which is efiieient in use,

and they parts whereof are readily assembled in such a manner as to obtain air-tight joints and perfect insulation. To Lthese other ends the invention consists in certain improvementsand combinations of parts, all as will be hereinafter more fully'described, the novel f features being pointed out in the claims at theend of the specification.

In the drawings: f n

Figure 1 is an enlarged longitudinal sectional view of a hot air syringe constructed in accordance with our invention;

Fig. 2 is an elevationlookingin the direction of the arrow in Fig. 1, parts of the view being shown in section; j

Fig. 3 is a horizontal sectional view on the line 3-3 of Fig. 2; f I

Fig. 4 is an enlarged view of the heating element removed; l A

Fig. 5 is a detail view of the sustaining member for attaching one end of the heating coil, and

Fig. 6 is a sectional viewon the line 6 6 ofFig.4.- W

Similar reference characters throughout the several views indicate similar parts.

AV syringe constructed in accordance with oury invention embodies a head portion 1, on whichV is fitted a tubular hand grip 2, and having a recess receiving they casing 4, containing the heating element 5 and carrying thefnozzle 6 at its outer end.y The head 1 has aportion containing the air passages which is connected to the pipe 7 leading toa 11, 1918. serial No. 257,734. f

source of air under pressure and within the hand grip Within the head is a valve chamber 9 containing a valve head 10, on a stem 11, ha ving a thumb piece 12 on its outer end, The valve head is normally held against its seat by a spring 18, resting in la recess in a screw plug 14, removably closing the valve chamber. y

The heatingr element 5 in Fig. 4 and consists of closed at its inner end 16,r and expanded at its outer end, as at 17, to receive a 'correspondingly expandedend 18 on an inner tube 19 which is spaced from the outer tube to provide an air passage between them. VVit-hin the inner tube is located the heating coil C of line elastic wire, one end of the coil being looped under the head of a screw 20, which passesvthrough insulating washers 21, on each side of the end 1G of the outer tube, and secured by a lock nut 22. The other end of the heating element, or coil, is engaged by a hook 23 on a transversely extending portion 24 of a ring 25 which is placed within the expanded end 18 of theinner tube and is shown in detail kheld thereon lby a washer 26 over which the end 17 of the outcr'tube 'is formed. The heating coil C is supported solely by means of the atta-ching portions at its opposite ends and in orderto prevent any accidental contact ofthe coil with the tube 19, and consequent short circuiting ofpart of the coil, we providean insulating sleeve 19a fitting within said tube and surrounding the coil.

The heating'element is located within the casing 4 and is secured thereinbyy means of the screw 20, which coperates with a securing member inthe form of a hollow sleeve 27 permanently fastened by means of a nut 28 to an insulating partition or disk '29 set within the end 3 oi the head 1. The disk 29 is prevented from removal by engagement therewith,of a flange 30 on atube, or sleeve, 31, surrounding the heating element and spaced therefrom except at its outer end which isengaged by the expanded end 17 of the heating element to make an air tight joint. An insulating ring 32, bears on the outside of the flange 30, and forced against it by a shouldered ring 33, which in Vturn is engaged by theinner end of the cas ing 4, and secured by means of the latter. which isV itself threaded into the recess of the head 1. A sleeve oit' asbestos, or other poor conductor of heat, isV inserted between an outer tube 15 5. In a heating element for a hot air syringe, the combination With an outer tube which has one end open'and expanded and its other end closed, of a secondctube Within the former also having an ex anded end engaging Within the correspon ing end of the'outer tube, a coil attachin portion resting Within the expanded en of the inner tube and held therein by `forming the end of the outer tube over it, a heating coil extending between the attaching portion and the closed end of the outer tube, the outer tube having circulating air openings adjacent its expanded end communicating with the space between said tubes.

6. In a syringe, a tubular hand grip provided Witha recess, a tubular casing secured in said recess yand extending at an angle to said grip, a supporting member extending into the end of said casing in saidrecess, an apertured outer tube spaced from sald 'casing Within the latter having an outer end engaging said casing and an inner end formed inwardly for engagement with said supporting member, an inner tube spaced from, said outer tube and open at both ends, a heating coil in said inner tube, and elecvtrical connections between saiddiand grip ture therein adjacent its outer end, an inner tube spaced from said outer tube and havingan opening at its inner end, a heating coil Within said inner tube, means for supporting the ends of said coil and connecting its outer end- With said conductive portion of the casing, and connections for supplying current to the latter and the inner end of said coil.

OSCAR H. PIEPER. ALPHONSE F. PIEPER. 

